JPS6143339Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drum-type facsimile device that maintains the wrapped state of a transmission document or recording paper around a drum by means of vacuum suction force.

In a drum-type facsimile device, a transmission document or recording paper is wound around a drum, and the drum is rotated to perform transmission or reception scanning.

There are various methods for keeping the document wrapped around the drum, but one method is to provide a large number of small suction ports on the circumferential surface of the hollow drum that communicate between the inside and outside of the drum. There is a method in which the inside of the drum is communicated with a vacuum pump, and the suction force of the vacuum pump causes the document, etc., to be attracted to the suction port, thereby maintaining the state in which the document, etc. is wound around the drum. However, in conventional facsimile machines that employ this method, the drum starts scanning and rotating as soon as the wrapping of the document, etc. around the drum is completed, so the document, etc. is not wrapped around the circumference of the drum. There is a drawback in that the drum starts scanning rotation before the document is brought into sufficient contact with the drum, and the document or the like often separates from the drum due to the centrifugal force generated by the rotation of the drum.

In addition, in order to compensate for the above-mentioned drawbacks, if we try to increase the suction power of the vacuum pump to increase the suction power of the document etc. at the suction port, it is necessary to use a large-capacity vacuum pump. However, there was a problem in that the entire device became larger.

The present invention has been developed to solve the above-mentioned drawbacks of the conventional drum type, which is capable of preventing the sending document or recording paper from coming off the drum at the start of scanning rotation without increasing the capacity of the vacuum pump. The purpose is to provide facsimile equipment.

The present invention will be described below based on embodiments shown in the drawings.

FIGS. 1 and 2 show an example in which the present invention is applied to a transmitting device, in which the drum 1 is hollow,
A large number of small suction ports (not shown) are provided on the circumferential surface of the drum 1 to communicate the inside and outside of the drum 1. A film gripping bar 2 is provided at one location on the circumferential surface of the drum 1. The drum 1 is rotated by a scanning drum drive motor 3, and also by a winding control motor 5 via a gear 4.
Further, a winding completion detection sensor 6 provided near one end of the drum 1 is configured to detect the rotational position of the drum 1.

A film box 7 is placed in front of the drum 1, and original films 8 are stored in the film box 7 in a stacked manner.
A pad mounting plate 9 is provided above the film box 7 so as to be rotatable about the longitudinal direction of the film, and a plurality of suction pads 10 in the form of suction cups are attached to the pad mounting plate 9. The pad mounting plate 9 is rotated by a pad drive motor 11 via a pad drive disk 12.

The film box 7 and pad mounting plate 9
A feed-out roller 13 is provided behind the feed-out roller 13, and this feed-out roller 13 is rotated by a feed-out roller drive motor 14.

A movable frame 15 is provided approximately between the drum 1 and the feeding roller 13, and is movable up and down.
This movable frame 15 is a plunger magnet 1.
It is designed to be raised and lowered by 6. A film guide plate 17 and a pressure roller 18 are attached to the movable frame 15, and a film detection sensor 19 is provided at the center of the film guide plate 17.

The inside of the drum 1 is connected to a vacuum pump 22 via a vacuum switch 20 and a solenoid valve 21.
The suction pad 10 is connected to the vacuum pump 22 via a solenoid valve 23. The scanning drum drive motor 3 is controlled based on the operation of a drum timer and vacuum switch 20 (not shown), and the timer is controlled by an output signal from a winding completion detection sensor 6.

In this embodiment, first, when a winding start signal is sent from a control device (not shown), the solenoid valve 21 is closed, the solenoid valve 23 is opened, and the vacuum pump 22 is operated. Then, original film 8
is absorbed by the suction pad 10. Next, in this state, the pad mounting plate 9 is rotated by the pad drive motor 11, whereby the original film 8 is conveyed to the entrance side of the feed roller 13. When the original film 8 is conveyed to the entrance side of the feed roller 13 in this manner, the plunger magnet 16 is activated and the movable frame 15 is lowered, so that the film guide plate 17 is opposed to the discharge side of the feed roller 13. At the same time, the pressure roller 18 is pressed against the drum 1.

At the same time, the solenoid valve 21 is opened while the solenoid valve 23 is closed, the suction pad 13 loses its suction force, and the feeding roller 13 is rotated by the feeding roller drive motor 14. For this reason,
The original film 8 is released from the suction pad 10,
The film is fed out toward the drum 1 by the feeding roller 13 while being guided by the film guide plate 17.

When the film detection sensor 19 detects the passage of the original film 8 while the original film 8 is being fed out by the feeding roller 13 in this manner, a timer for the feeding roller (not shown) is activated, and this timer is activated after a certain period of time has elapsed. , the feeding roller drive motor 14 is stopped. As a result, the feed roller 13 stops rotating when the end of the document film 8 is gripped by the film gripping bar 2.

Next, after the end of the original film 8 is gripped by the film gripping bar 2 as described above, the drum 1 is rotated by the winding control motor 5, and the original film 8 is sequentially pressed against the drum 1 by the pressure roller 18. At the same time, it is wound around the drum 1 while being attracted to the suction port. When the drum 1 is rotated by a predetermined angle and the wrapping of the original film 8 around the drum 1 is completed, the wrapping completion detection sensor 6 detects the wrapping completion from the rotational position of the drum 1, and stops the wrapping control motor 5.
The rotation of the drum 1 is stopped, and the drum timer is activated.

Thereby, the drum timer sets a predetermined time t seconds starting from the time when the wrapping of the document film 8 around the drum 1 is completed. This t seconds is the time required for the original film 8 to come into complete contact with the circumferential surface of the drum 1. Then, until the t seconds have elapsed, the drum 1 continues to be in a stopped state regardless of the state of the vacuum switch 20. When the wrapping of the original film 8 around the drum 1 is completed, all the suction ports are blocked by the original film 8, so that the pressure inside the drum 1 decreases during the t seconds, and the original film 8 is completely wrapped around the drum 1. 8
comes to be in complete contact with the circumferential surface of the drum 1.

Then, when the t seconds have elapsed and it is confirmed by the vacuum switch 20 that the pressure inside the drum 1 has decreased to a predetermined value or less, it is confirmed that the document film 8 is in close contact with the circumferential surface of the drum 1. ,
The drum 1 is first started to rotate at high speed for scanning by the scanning drum drive motor 3. Therefore, the scanning rotation of the drum 1 is always started after the original film 8 has completely come into close contact with the drum 1, so the original film 8 does not separate from the drum 1 at the start of scanning rotation. .

Note that at an appropriate time after the wrapping of the original film 8 around the drum 1 is completed and until the scanning rotation of the drum 1 is started, the movable frame 15 is raised by the plunger magnet 16, and the pressure roller 18 is moved around the drum 1. be separated from

Although the above embodiments show examples in which the present invention is applied to the transmitting side, the present invention can also be applied to the receiving side where recording paper is wound around a drum. Furthermore, the material of the transmission document and the recording paper wound around the drum is not limited to the above-mentioned film-like material, but may be of any material.

As described above, the drum-type facsimile device according to the present invention stops the rotation of the drum for the time required for the transmitted document or recording paper to completely adhere to the drum after wrapping the transmitted document or recording paper around the drum. By starting the scanning rotation only after a certain period of time, an excellent effect can be obtained in that it is possible to prevent the document to be sent or the recording paper from coming off the drum at the start of the scanning rotation, without increasing the capacity of the vacuum pump. That's what you get.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the main parts of an embodiment of a drum-type facsimile apparatus according to the present invention, and FIG. 2 is a side view showing the main parts of this embodiment. 1...Drum, 2...Film gripping bar, 5
... Wrap control motor, 6 ... Wrap control motor, 8 ... Original film, 9 ... Pad mounting plate, 10 ... Suction pad, 13 ... Feeding roller, 17 ... Film guide plate, 18 ... Pressure roller , 19... Film detection sensor, 21... Solenoid valve, 22... Vacuum pump, 23... Solenoid valve.

Claims (1)

[Scope of utility model registration request] A hollow drum, a plurality of suction ports provided on the circumferential surface of the drum and communicating between the inside and outside of the drum, a vacuum pump communicating with the inside of the drum, and a document sent to the drum while rotating the drum. or winding means for winding recording paper; wrapping completion detection means for detecting completion of winding of the transmission original or recording paper around the drum by the winding means; and winding completion detection means for detecting completion of winding of the transmission original or recording paper around the drum; A drum comprising: control means for stopping the drum for a time necessary for the transmission document or recording paper to come into complete contact with the drum when the completion of winding of paper is detected, and then causing the drum to start scanning rotation. facsimile machine.